Steven Moffat has revealed the titles and details of episodes two and three of the new series of Doctor Who.

Speaking at San Diego's Comic-Con, the sci-fi show's showrunner announced that dinosaurs would provide an obstacle to Matt Smith's Doctor and the Ponds in episode two of series seven. The title of the episode is 'Dinosaurs on a Spaceship'.

"'Dinosaurs on a Spaceship' - what more do you need? The Doctor will come face to face with some of the most monstrous creatures evolution has ever produced, on some of the most monstrous sets we've ever built," said Moffat.

"We took one look at Chris Chibnall's brilliant script and said to ourselves, 'We're going to need a bigger corridor'."

Fast Show comic Mark Williams and Sherlock actor Rupert Graves will appear in the dino-episode.

Commenting on Toby Whithouse-penned episode three 'A Town Called Mercy', Moffat said: "It takes us into a genre Doctor Who hasn't attempted since the sixties - it's a full-blooded western. We knew from the start we need some serious location shooting for this one, and given the most iconic American setting imaginable, there was only one place to go - Spain."

Moffat also spoke for the first time about the series premiere 'Asylum of the Daleks', commenting: "It's 'wow'. It's lots and lots and lots of Daleks. It's what we all see when we close our eyes in our TARDIS-wallpapered bedrooms.

"More Daleks than you've ever seen in one place."

The new series of Doctor Who will air in the US and UK in mid-August. The first screening of 'Asylum of the Daleks' will be at the London BFI on August 14.